Kendrick Lamar's verse on Future and Metro Boomin's "Like That" record will forever go down in infamy for its shots aimed at Drake and J. Cole -- but the guy behind one of the samples in the track, Rodney O, says it pains him to even hear it because he hasn't been getting paid his royalties!!!…

Barry White's son is almost broke and nearly homeless ... and he claims it's all because he's getting the raw end of the deal from his father's trust. Darryl White is suing the legendary singer's estate and Barry's widow, Glodean White, saying she promised he'd get his fair cut, IF he agreed to…